Business Minded

Call it a Poor Man's Thought Transmitter if you will, but the effect is the same only done with business cards! This is from Bob Solari.
Bring out a stack of business cards bound with a rubber band. Remove a card and draw a crystal ball on its back. Have a spectator draw anything they wish in the center of the crystal ball. They slide the card into the center of your pile of cards face down. You remove a second card and draw the same picture of a crystal ball. Focus on their thoughts and begin to duplicate their exact drawing or writing.
The effect and working is so good that Steve Dusheck has included it in his forthcoming magic book on business card magic!